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In vivo validation of the coincidence of the peak and end of the T wave with full repolarization of the epicardium and endocardium in swine.

Abstract：

OBJECTIVES/BACKGROUND:Previous in vitro studies have suggested full repolarization of the epicardium coincides with the peak of the T wave (T(peak)) and that of the M cells coincides with the end of the T wave (T(end)). However, in vivo validation of the theory is lacking. METHODS:Monophasic action potentials (MAPs) were recorded using the CARTO mapping system from 51 +/- 10 epicardial sites and 64 +/- 9 endocardial sites of the left ventricle in 10 pigs and from 41 +/- 4 epicardial sites and 53 +/- 2 endocardial sites of the right ventricle in two of the 10 pigs. End of repolarization (EOR) times over the epicardium (EOR(epi)), endocardium (EOR(endo)), and over both (EOR(total)) were obtained. QT(peak) and QT(end) intervals were measured from simultaneously recorded 12-lead ECG. RESULTS:Minimal and maximal EOR(total) were observed in the left ventricle in all pigs. Minimal EOR(total) was on the epicardium in five pigs, and maximal EOR(total) was on the endocardium in nine pigs. Minimal, mean, and maximal QT(peak) intervals all were significantly smaller than maximal EOR(epi) (322 +/- 23 ms, P <.01). No significant difference was found between maximal QT(end) interval (338 +/- 30 ms) and maximal EOR(endo) (339 +/- 24 ms, difference = 1 +/- 19 ms, P =.92), between maximal QT(end) interval and maximal EOR(total) (341 +/- 24 ms, difference = 2 +/- 18 ms, P =.69), or between minimal QT(peak) interval (283 +/- 28 ms) and minimal EOR(total) (282 +/- 20 ms, difference = 0 +/- 15 ms, P =.95). CONCLUSIONS:In in vivo pig models, T(peak) does not coincide with full repolarization of the epicardium but coincides well with the earliest EOR, whereas the T(end) corresponds with the latest EOR. These findings suggest that not only the transmural gradients but also the apicobasal repolarization gradients contribute to genesis of the T wave.

journal_name

Heart Rhythm

journal_title

Heart rhythm

authors

Xia Y,Liang Y,Kongstad O,Liao Q,Holm M,Olsson B,Yuan S

doi

10.1016/j.hrthm.2004.11.011

keywords:

subject

Has Abstract

pub_date

2005-02-01 00:00:00

pages

162-9

issue

2

eissn

1547-5271

issn

1556-3871

pii

S1547-5271(04)00791-X

journal_volume

2

pub_type

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